package com.Guuka.reggie.filter;


import com.Guuka.reggie.common.R;
import com.Guuka.reggie.entity.Employee;
import com.alibaba.fastjson.JSON;
import com.Guuka.reggie.common.BaseContext;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否已经完成登录
 */
@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {

    //路径匹配器
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        String requestURI = request.getRequestURI();

        log.info("拦截到请求：{}",requestURI);

        //定义不需要请求的路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/user/login",
                "/user/logout",
                "/backend/**",
                "/front/**",
                "/common/**"
        };
        boolean check = check(urls,requestURI);
        if(check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }

        if(request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录，用户Id为:{}",request.getSession().getAttribute("employeee"));

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request,response);
            return;
        }

        log.info("用户未登录");

        //通过输出流向页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return ;

//        log.info("拦截到请求：{}",request.getRequestURI());
//        filterChain.doFilter(request,response);
    }

    /**
     * 检查本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url,requestURI);
            if(match){
                return true;
            }
        }
        return false;
    }

}
